Looking for military uniform pattern. Sewing Machines Parts and Sales in Los Angeles

Hello all! I’m new to this sub, but have been making cosplay for about a year now. Mostly I’ve been able to eyeball my costumes when sewing so far, but I’m seeing if I can do a uniform from Knights of Sidonia next, which definitely needs a pattern. Not sure where the best place is to find one. I’d be fine with modifying an existing pattern, seeing as I doubt an exact pattern exists – just need a place to start 🙂

Reference pictures: http://imgur.com/a/8wGkN

Thanks!